Spectrum

Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_602), powder with grains > 160 µm

Title
Vis-NIR reflectance spectrum of Roussillon pigment (PIG_0173_A_602), powder with grains > 160 µm
DOI
10.26302/SSHADE/EXPERIMENT_BS_20191012_400
Data reference
Schmitt, Bernard; Chalmin-Aljanabi, Emilie; Chassin de Kergommeaux, Aurélie (2019): Vis-NIR reflectance spectra of Roussillon pigments (PIG_0173_A): raw blocks, powders with different grain sizes and painted matter. SSHADE/PIG (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20191012_400
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Instrument
SHADOWS Spectro-Gonio bidirectional reflection Vis-NIR
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 402.0 - 666.0 4.0 1.9 0.25
#2 670.0 - 798.0 4.0 3.8 0.5
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 several high frequency filters output of monochromator
Scan number
10
Comments
measured over the 362-802nm range
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution illumination
5.8°
Resolution observation
4.1°
Illumination
Observation
Comments
some wavelength dependent polarization
Observation mode
single spot
Resolutions
5.2 ${\pm}$ 0.1 $mm$
Comments
illumination with 8 fiber optic spots within a 5.2 mm diameter, observation within an ellipse of 23x20 mm
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
cylindrical raw aluminium sample holders of different sizes and depths
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 802.0 - 1426.0 4.0 3.8 0.5
#2 1430.0 - 3198.0 4.0 7.6 1.0
#3 3202.0 - 4186.0 8.0 15.4 2.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 several high frequency filters output of monochromator
Scan number
10
Comments
measured over the 402-4202nm range
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution illumination
5.8°
Resolution observation
4.1°
Illumination
Observation
Comments
some wavelength dependent polarization
Observation mode
single spot
Resolutions
7.5 ${\pm}$ 0.2 $mm$
Comments
illumination with 9 fiber optic spots within 7.5 mm diameter, observation within an ellipse of 23x20 mm
Experiment
Vis-NIR reflectance spectra of Roussillon pigments (PIG_0173_A): raw blocks, powders with different grain sizes and painted matter
Date begin
2020-02-26
Release date
2020-08-28 04:42:57 UTC+0000
Version (Date)
#1 (2020-08-28 04:42:57 UTC+0000, Updated: 2022-11-07 08:01:01 UTC+0000)
History
Date Mode Version Status Comments
2020-06-29 06:13:52 UTC+0000 first import #1 valid version
Analysis
raw bidirectional reflectance spectrum calibrated: 1) with "Spectralon 99%" measured under same geometry using its absolute BRDF (0.35-1.3µm) and 2) with "Infragold" using its relative spectral reflectance (1.3-4.2µm). The visible spectrum (352-998nm) is scaled by a factor 0.995 (due to slightly different compaction and surface texture) and merged with the NIR spectrum (1-4.2 µm). A subtraction of the residual H2O absorption bands have been applied and a slight smoothing (binomial over 5 points) has been applied in the NIR range, except in the narrow absorption bands. Below 500nm the data (dark and flat) have been interpolated from older measurements at lower resolution (5nm, 10nm sampling).
Quality flag
4
Validator(s)